refs #24: added a test to get list types with valid and invalid numId/ilvl combinations
refs #24: If an invalid numId or ilvl is used (for whatever reason) getting the list type will always fall back to decimal.
refs #24: update note
refs #24: updates based on code review
refs #24: added a comment
refs #24: name change
Merge pull request #24 from PolicyStat/issue_24

Determing list type can cause a key error